JP2011033386A - Information providing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information providing apparatus which performs route search depending on antenna receiving sensitivity. <P>SOLUTION: The information providing apparatus having a broadcast receiving part for receiving broadcast radio waves transmitted from a broadcast tower and a receivable area acquisition part for acquiring the receivable area of the broadcast tower includes: a route search conditions input part for inputting route search conditions; a broadcast tower determination part for calculating the current position of the information providing apparatus from a GPS signal and determining a broadcast tower to be used in a route from the current position to a destination included in the route search conditions; a receivable area storage part for storing the receivable are; and a route calculation part which retrieves a receivable area for each determined broadcast tower from the receivable area storage part, selects at least one area out of areas which are different in a step manner within each receivable area on the basis of the current receiving conditions of the broadcast receiving part, and calculates a route which receives the broadcast radio waves from each selected area and the route search conditions. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an information guide device, and more particularly to an information guide device that uses a receivable area according to the reception sensitivity of an antenna.

  In the conventional information guide device, the receivable area based on the reception state of the radio wave transmitted from the broadcast tower is defined in advance according to the strength of the radio wave, the presence or absence of a shield, and the like. Search for route candidates that can arrive at the destination while watching various broadcasts such as digital broadcasts without interruption using information such as distance, desired destination arrival time, road type, fee, and traffic jam information .

  FIG. 1 is a block diagram showing a configuration of a conventional information guidance apparatus 10. Radio waves transmitted from the broadcast tower are received by the TV antenna 1. As the TV antenna 1, an arbitrary antenna such as a film antenna, a glass antenna, a rod antenna, a dipole antenna, a Yagi / Uda antenna, a parabolic antenna, a loop antenna, a dielectric antenna, or the like is used. In digital broadcasting, analog information such as images and sounds are converted into digital signals and compressed by encoding, and then a plurality of pieces of compressed information are combined by multiplexing. Also, a guard interval of a certain time to suppress the influence of interference between symbols is inserted, and a code for correcting an error during transmission is added by error correction coding, and the signal is digitally modulated and transmitted from the broadcasting tower. The The radio wave received by the TV antenna 1 is sent to the broadcast receiving unit 2, where a physical channel is selected and amplified. Then, after being converted into an image signal through digital conversion and OFDM (Orthogonal Frequency Division Multiplexing) demodulation, an analog signal is generated and displayed on the display unit 5. The control unit 3 performs system control of the broadcast receiving unit 2, the display unit 5, and the route search unit 7.

  In addition, the information guidance device 10 is provided with a VICS antenna 6 for receiving radio waves of a road traffic information communication system (VICS). The VICS signal received via the VICS antenna 6 is sent to the route search unit 7. The VICS signal includes road traffic information around the vehicle such as traffic jam information, required time information, regulation information due to accidents, construction, disasters, weather conditions, and the like, parking location and full / empty vehicle information, and the like. Furthermore, the GPS antenna 8 of the information guide device 10 receives radio waves from GPS satellites. By tracking GPS signals transmitted from GPS satellites and acquiring GPS data, we measure the pseudoranges between the GPS satellites and the vehicle, and geometrically based on the pseudoranges for multiple GPS satellites measured at the same time. A positioning calculation is executed to obtain a geometric position with respect to the GPS satellite, and a current position of the vehicle is detected.

  In addition, the data regarding the radio wave receivable area from each broadcasting tower in the information guide device is stored in advance in the information guide device as a receivable area database. FIG. 2 is a diagram showing the information of the receivable areas stored in the receivable area database in coordinates. The center of the reception area is the broadcast tower position. As shown in the figure, the reception status at each point on the coordinates changes depending on the intensity of the radio wave oscillated by the broadcast tower and the influence of shielding or reflection of radio waves by buildings, mountains, hills, etc. Receivable areas come in various shapes.

  The control unit 3 accepts input from the user via the input unit 9 of information on the departure point and destination in the route search, information on a desired viewing program, destination arrival time, and the like. Based on the information obtained from the broadcast receiving unit 2, the route searching unit 7, and the input unit 9 and the information on the receivable area, the optimum route that can reach the destination without interruption of the program desired to be viewed is calculated. The corresponding route is displayed on the display unit 5.

JP 2007-101408 A

  However, information that affects reception sensitivity, such as an antenna combining function and an antenna mounting position in the information guide device, is not considered in the receivable area of the conventional technology. Therefore, depending on the performance of the information guide device and the number of antenna diversity, there may be a route in which a state in which digital broadcasting or the like cannot be viewed occurs in the calculated route as described above. In addition, since the number of diversity capable of receiving broadcast radio waves that the user desires to watch is unknown, all antennas must be energized at all times.

  The present invention has been made in view of the above. An object of the present invention is to provide a receivable area having a different area for each reception condition so that the user can move while viewing a program that is currently being viewed or desired to be viewed with stable reception sensitivity. It is to realize a more reliable information guidance device.

  According to the information guide device of the embodiment of the present invention, the information guide device includes a broadcast receiving unit that receives broadcast radio waves transmitted from the broadcast tower and a receivable area acquiring unit that acquires a receivable area of the broadcast tower. A route search condition input unit for inputting route search conditions, and a broadcast used to calculate the current position of the information guidance device from the GPS signal and to use the route from the current position to the destination included in the route search conditions A broadcast tower identification unit for identifying a tower, a receivable area storage unit for storing a receivable area, and a receivable area for each broadcast tower identified by the broadcast tower identification unit from the receivable area storage unit, and receiving the broadcast Based on the current reception conditions of the selected part, select at least one of the different areas within the extracted receivable areas, and select each area and the route search condition. , Characterized in that it comprises a path calculation unit for calculating a reception possible paths airwaves. Therefore, it is possible to perform a more accurate route search that reflects the reception status of the broadcast receiving unit of the information guide device currently in use.

  According to the information guide apparatus of another embodiment of the present invention, the information guide apparatus having a broadcast receiving unit that receives broadcast radio waves transmitted from the broadcast tower and a receivable area acquiring unit that acquires a receivable area of the broadcast tower. The route search condition input unit for inputting the route search condition and the current position of the information guidance device are calculated from the GPS signal and used in the route from the current position to the destination included in the route search condition. A broadcast tower specifying unit for specifying a broadcast tower, a receivable area storage unit for storing a receivable area, and a receivable area for each broadcast tower specified by the broadcast tower specifying unit are extracted from the receivable area storage unit and taken out. Based on the current reception conditions of the broadcast receiving unit and the receivable area calculating unit that calculates a receivable area in which different areas are set in stages based on each receivable area. And selecting at least one of the stepwise different regions within each receivable area calculated by the receivable area calculating unit, and selecting a route capable of receiving broadcast radio waves from each selected region and the route search condition. And a route calculation unit for calculating. Therefore, it is possible to reduce the data amount of the receivable area stored in the information guide device.

  Preferably, the route calculation unit further calculates a route using traffic information included in the VICS signal. The reception conditions include the number of antennas, antenna gain, and diversity number of the broadcast receiving unit. More preferably, a display unit for displaying the route calculated by the route calculation unit is further provided.

  According to the information guide device of still another embodiment of the present invention, the information guide includes a broadcast receiving unit that receives broadcast radio waves transmitted from the broadcast tower and a receivable area acquiring unit that acquires a receivable area of the broadcast tower. A broadcast tower identification unit that identifies a broadcast tower that is currently receiving a broadcast, a receivable area storage unit that stores a receivable area, and a broadcast tower identification unit that is identified from the receivable area storage unit An antenna that takes out the receivable area for the broadcast tower and changes the number of antennas of the broadcast receiving section to be energized for each stepwise different area in the extracted receivable area based on the current reception conditions of the broadcast receiving section An energization change unit. Therefore, it is possible to perform information guidance while achieving power saving by conducting the current to the optimum antenna according to the reception status of the broadcast receiving unit.

  According to the information guide device of still another embodiment of the present invention, the information guide includes a broadcast receiving unit that receives broadcast radio waves transmitted from the broadcast tower and a receivable area acquiring unit that acquires a receivable area of the broadcast tower. A broadcast tower identification unit that identifies a broadcast tower that is currently receiving a broadcast, a receivable area storage unit that stores a receivable area, and a broadcast tower identification unit that is identified from the receivable area storage unit A receivable area calculation unit that extracts a receivable area for a broadcast tower and calculates a receivable area in which different areas are set in stages based on the extracted receivable area, and a current reception condition of the broadcast reception unit An antenna that changes the number of antennas of the broadcast receiving unit to be energized for each stepwise different area within the receivable area calculated by the receivable area calculating unit And a conductive changing unit. Preferably, the reception conditions include the number of antennas, antenna gain, and diversity number of the broadcast receiving unit.

  According to the information guide device of still another embodiment of the present invention, the information guide device includes a broadcast receiving unit that receives broadcast radio waves transmitted from the broadcast tower, and the route search condition for inputting the route search condition An input unit, a current position calculation unit that calculates the current position of the information guide device from the GPS signal, an information transmission unit that transmits the current position and the route search condition to an external server, and a destination included in the route search condition from the current position A route capable of receiving broadcast radio waves calculated by an external server from at least one region of stepwise different regions in the receivable area for each broadcast tower used in the route to the route and the route search condition, An information receiving unit that receives from the server and a display unit that displays the received route are provided. Therefore, a more accurate route search can be performed by applying the information guidance apparatus of the present invention to a mobile communication terminal.

  According to the information guide device of the present invention, it is possible to use a receivable area in which different areas are set according to the reception status of the broadcast receiving unit. Therefore, in the broadcast reception of the information guide device, it is possible to search for a route that can continuously receive the broadcast even if the number of diversity changes. In addition, by reducing the number of antennas that are energized when moving to a region where reception sensitivity is better, such as by reducing the number of antennas that are energized, the power consumption of the information guidance device can be reduced Can also be achieved.

It is a block diagram which shows the outline of a structure of the conventional information guidance apparatus. It is the schematic which shows the receivable area used for the conventional information guidance apparatus. It is a block diagram which shows the outline of a structure of the broadcast receiving part of the information guidance apparatus in one Embodiment of this invention. It is the schematic which shows the receivable area used for the information guidance apparatus in one Embodiment of this invention. It is a block diagram which shows the outline of a structure of the information guidance apparatus in one Embodiment of this invention. It is a block diagram which shows the outline of a structure of the route search part of the information guidance apparatus in one Embodiment of this invention. It is a block diagram which shows the outline of a structure of the information guidance apparatus in another embodiment of this invention. It is a block diagram which shows the outline of a structure of the antenna change part of the information guidance apparatus in another embodiment of this invention. It is a flowchart which shows the content of the process which changes the electricity supply of an antenna in another embodiment of this invention.

  Hereinafter, an information guide apparatus according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows a block diagram of a reception method in the information guide device. The method shown in FIG. 3 is called a maximum ratio combining diversity method and is used for a digital terrestrial broadcast receiver. Radio waves transmitted from the broadcast tower are received by the antennas 21a to 21d and sent to the respective tuner circuits 22a to 22d. Each of the tuner circuits 22a to 22d has an input tuning circuit, a mixing circuit, a local oscillation circuit, and an output filter (not shown). The input tuning circuit is composed of a single tuning circuit that can be tuned to the frequency of a signal corresponding to each channel to be received, and the tuning frequency is variable so that a channel from a low frequency channel to a high channel can be selected. The received signal selected by the input tuning circuit is input to the mixing circuit without being attenuated. The reception signal input to the mixing circuit is mixed with the local oscillation signal from the local oscillation circuit to be frequency-converted into an intermediate frequency signal. The frequency of the intermediate frequency signal is the same as the intermediate frequency of an analog television. Therefore, the frequency of the local oscillation signal from the local oscillation circuit is also uniquely determined, and the frequency of the local oscillation signal is always higher than the frequency of the reception signal by the frequency of the intermediate frequency signal. The intermediate frequency signal from the mixing circuit is output to the weighting synthesis circuit 23 via the output filter. The output filter is composed of a bandpass filter having a pass band of approximately 6 MHz, and removes signals of adjacent channels.

  The weighting synthesis circuit 23 ranks the signals according to the strength of the radio waves received by the antennas, weights and synthesizes the signals from the tuner circuits, and sends them to the OFDM demodulation circuit 24. In the maximum ratio combining diversity method, multicarrier transmission called orthogonal frequency division multiplexing (OFDM) is adopted, and the frequency of each carrier is set so that the carriers are orthogonal to each other within the symbol period of the OFDM symbol. Is set. The serially transmitted information is parallel-converted and output for each symbol period slower than the information transmission rate, and a plurality of parallel-converted data is assigned to each carrier and modulated for each carrier. Then, the inverse fast Fourier transform (IFFT) is performed on the plurality of carriers to convert them into signals on the time axis while maintaining the orthogonality of each carrier on the frequency axis, and transmitted to the MPEG-2 decoding circuit 25. The signal sent to the MPEG-2 decoding circuit 25 is subjected to error correction processing, decoded, and output as broadcast data. Information such as the number of antennas mounted on the vehicle, the number of diversity currently used, and the reception sensitivity of the antennas can be extracted from the signal after demodulation in the OFDM demodulation circuit 24. The extracted information is sent to the route search unit 17.

  Next, the receivable area of the information guide device will be described. In this embodiment, the reception intensity of the broadcast tower receivable area varies depending on the antenna gain and the number of diversity. Also, even if the antenna gain and the number of diversity are the same, the reception intensity differs depending on whether the city is a city area or a suburb. Here, the data of the receivable area by simulation is shown in Table 1.

  As shown in Table 1, the transmission distance characteristic models a multipath characteristic in an urban area. The service area indicates the distance from the broadcast tower. The moving speed of the vehicle is assumed to be about 40 km / h. Each numerical value varies depending on reception conditions such as antenna installation height, radio wave environment, geographical environment, vehicle type, and the like. In Table 1, simulation data in the three-system diversity is not described, but the three-system diversity data can be estimated by obtaining a fitting function from the diversity data in the first, second, and fourth systems.

  FIG. 4 shows a schematic diagram of a receivable area created based on the data in Table 1 and taking into account the influence of radio wave shielding or reflection. As in FIG. 2, the center of the receivable area is the position of the broadcast tower. The receivable area shown in FIG. 4 is an area when an antenna having an antenna gain of −5 dBi is mounted and travels in an urban area. The area inside the boundary line 31 is a receivable area in the 4-system diversity. Similarly, areas inside the boundary lines 32, 33, and 34 become receivable areas in the diversity of three systems, two systems, and one system, respectively. From the diversity data of the four systems shown in Table 1, a range within 41 km is estimated as a receivable area. In this embodiment, the factors that change the reception sensitivity of the antenna include the radio wave environment, geographical environment, vehicle type, number of diversity, number of antennas, antenna type (ie, antenna gain), antenna mounting position, broadcast radio wave type (one segment / full segment) ) Is taken into consideration to create a coverage area. The boundary line 31 is obtained by calculating the influence of these factors in consideration of the data in Table 1. Similarly, the boundary lines 33 and 34 of the receivable area in the diversity of 1 and 2 systems are also obtained. In Table 1, the boundary line 32 of the receivable area in the three systems of diversity is estimated and obtained because the service area differs by about 10 km when one system is different. As shown in the figure, the receivable area obtained in this way is defined by a coordinate group representing the boundary.

  In the present embodiment, a database for creating and storing a large number of receivable areas shown in FIG. 4 in consideration of various reception conditions is constructed and stored in a receivable area storage unit in the information guide device. Here, the reception number is the number of diversity, the number of antennas, the type of antenna, the antenna mounting position, and the type of broadcast radio wave, and the receivable area of each broadcast tower corresponding to these reception conditions is calculated. Store as a file in the database. In solving the problems in the present invention, not limited to the above factors, for example, factors such as the vehicle height and moving speed of the vehicle may be further considered, and combinations of factors can be arbitrarily determined. . The file name of each receivable area is set by representing each reception condition used for area calculation with 2 bits and separating each condition with dots. Here, regarding the number of diversity, the unit for one seg is 00, no diversity is 01, the diversity of 10 is 10, the diversity of 11 is 11, the number of antennas is 1, 00, 01, 10, 11; for the antenna type, the film antenna is 00, the rod antenna is 01, the glass antenna is 10, the other antennas are 11, and the antenna mounting positions are 00 for the front, 01 for the rear, Assume that rear is 10 and other is 11, and the type of broadcast radio wave is 00, 1seg is 01, and 10 and 11 are others. For example, when a total of four film antennas are mounted on the front and rear, and the vehicle is traveling while performing one-segment broadcast reception with two systems of diversity, the file name of the receivable area to be used is “10.11.00.10. 01 ”. Note that a file name in which each reception condition is further subdivided and divided by the number of bits of 3 bits or more may be used.

  Therefore, in the information guide device, the file corresponding to the above file name is extracted from each receivable area database stored in the receivable area storage unit until the destination arrives, and the reception stored in the file is received. The route search according to various conditions can be executed using the possible area. For this reason, when the number of diversity is 2 even though four antennas are equipped, conventionally, since there are four antennas, the route search is performed using the receivable area when the diversity number is 4. Even when traveling on the route estimated to be optimal, there was a possibility that a situation in which broadcasting could not be received with the diversity of the two systems occurred. In the present invention, the coverage area that more accurately reflects the reception sensitivity of the vehicle is provided. It is possible to perform a route search using this, and it is possible to avoid a situation in which a broadcast cannot be received while traveling on a route.

  FIG. 5 is a block diagram showing an outline of the configuration of the information guide apparatus 100 in the present embodiment. Since the constituent elements other than the route search unit 17 are the same as those in the related art, description thereof is omitted. An outline of each component in the route search unit 17 is shown in FIG. The GPS signal acquisition unit 41 is a GPS signal from the GPS antenna 8, the VICS signal acquisition unit 46 is a VICS signal from the VICS antenna 6, the input condition acquisition unit 47 is a route search condition from the input unit 9, and the vehicle signal acquisition unit 48 is a vehicle. Vehicle signals are respectively acquired from an information storage unit (not shown). The route calculation unit 45 receives the GPS signal from the GPS signal acquisition unit 41 and calculates the current position of the information guide device 100. In addition, the route calculation unit 45 receives the route search condition from the input condition acquisition unit 47 and specifies a broadcast tower to be used in the route from the current location to the destination. The receivable area acquisition unit 42 acquires the receivable area of each broadcast tower transmitted from the external server. The acquired receivable area is stored in the receivable area storage unit 43. The route calculation unit 45 extracts the receivable area of the corresponding broadcast tower from the receivable area storage unit 43 based on the specified broadcast tower. Further, the route calculation unit 45 is configured to receive the current reception conditions of the broadcast reception unit 2, traffic information included in the VICS signal received from the VICS signal acquisition unit 46, vehicle type and vehicle height included in the vehicle signal received from the vehicle signal acquisition unit 48, and the like. 4 is selected from the reception areas shown in FIG. 4 set in the extracted receivable area, and a desired program broadcast is transmitted from the selected reception area and the route search conditions. The route that can arrive at the destination while receiving is calculated. The calculated route is displayed on the display unit 5 as a route search result.

  Next, a second embodiment of the present invention will be described. In the present embodiment, a plurality of reception areas in the receivable area are calculated from one reception area as a reference. In this case, the number of antennas, the number of diversity, and the antenna gain are employed as factors that accurately reflect the performance of the antenna in the reception area. Then, for each broadcast tower, a file is created using the receivable area in which one receiving area is set based on these factors as a reference receivable area, and is stored in the receivable area storage unit 43. In addition, a predetermined fitting function for calculating the reception area in accordance with changes in each factor is obtained in advance. This function is held by the receivable area calculation unit 44. The receivable area calculation unit 44 applies a fitting function to data of a file in which a reference receivable area for each broadcast tower used in the route to the destination is stored, and is a reception area that matches the current reception situation. Is calculated. Then, the route calculation unit 45 can perform a route search similar to that of the first embodiment using the calculated reception area. Note that the fitting function may be a function specific to each requirement, or a function obtained by combining the functions. In addition, the factors that define the reception area are not limited to the above factors, and various factors and combinations may be adopted as in the first embodiment.

  For example, for each broadcast tower, a receivable area in the case of reception with four systems of diversity is set as a reference receivable area. In other words, a total of 10 receivable areas corresponding to four types of diversity with respect to each antenna gain (-15, -10, -5, 0, 5 dBi) for urban areas and suburban areas are received based on the standard of one broadcasting tower. Make it possible area. Here, it is assumed that three film antennas having an antenna gain of −5 dBi are mounted and traveling in an urban area while receiving with two systems of diversity. Here, a case is considered in which a route search to a specific destination is performed without changing the reception conditions. The information guide device first acquires a file in a standard receivable area for an urban area with an antenna gain of −5 dBi in a broadcast tower that is currently receiving a broadcast. The reference receivable area corresponds to the receivable area defined by the boundary line 31 in FIG. Next, using the fitting function obtained in advance as described above, the receivable areas in the three systems of diversity are calculated. This receivable area corresponds to the receivable area defined by the boundary line 32 in FIG. Then, the optimum route is searched in the calculated receivable area. When the broadcast tower used in the course of the route search is switched, the standard receivable area file is extracted for each broadcast tower, and the route search is performed using each file. It can be carried out.

  In the second embodiment, if only the file of the reference receivable area is prepared, the receivable area in which the reception area for other reception conditions is set can be calculated simply by applying the fitting function. Compared to the first embodiment, the size of the database can be reduced.

  In the first and second embodiments, each combination of antennas when antennas are installed on both the front and rear (for example, when four antennas are installed, one on the front, three on the rear, Depending on whether you have two receptions at the rear or three at the front and one at the rear) A route search in the case of receiving with only one of the antennas can be performed. Therefore, in the information guide device of the present invention, it is possible to perform an appropriate route search even when receiving broadcasts of different channels with the front antenna and the rear antenna.

  Next, a third embodiment of the present invention will be described. FIG. 7 is a block diagram showing an outline of the configuration of the information guide device 200 in the present embodiment. Since the components other than the antenna changing unit 18 are the same as those in the first and second embodiments, description thereof is omitted. FIG. 8 shows an outline of each component in the antenna changing unit 18. Since the components other than the antenna energization changing unit 55 are the same as the components in the first and second embodiments, the description thereof will be omitted. The antenna energization change unit 55 identifies the broadcast tower that is currently receiving the broadcast, extracts the receivable area for the corresponding broadcast tower from the receivable area storage unit 43, and sets the reception area set in the receivable area. Accordingly, the number of TV antennas 1 to be energized is changed. Similarly to the second embodiment, each reception area can be calculated from the reference receivable area in the receivable area calculation unit 44.

  Therefore, in this embodiment, since the receivable area for each diversity number can be grasped, the minimum number of diversity necessary for the broadcast being received at the current point is known. Therefore, it is possible to reduce power consumption while performing stable broadcast reception in the entire information guide device by cutting off energization to antennas that are not necessary for reception or increasing or decreasing the number of antennas that are energized when passing through the boundary of the receivable area. The effect that it can be realized is also obtained.

  FIG. 9 shows a flowchart for changing the number of antennas. First, it is determined whether or not the data of the receivable area for each diversity number at the current point has been acquired (S101). When the necessary data of the receivable area is acquired, the minimum diversity number d that can receive the currently viewed broadcast is determined (S102). Next, the current diversity number D of the broadcast receiving unit is compared with d to determine whether D = d (S103). If D = d, there is no need to change the number of diversity, so the process is terminated. If D = d is not satisfied, it is first determined whether D> d (S104). If D> d, since the broadcast can be received even if the number of diversity is reduced, the power supply to any one of the antennas is cut off and the current number of diversity is reduced by one (S105). Then, by repeating S104 and S105, the current number of diversity can be reduced to the minimum required number of diversity. On the other hand, if the number of diversity is insufficient to receive the broadcast that the user desires to view, the process proceeds from S104 to S106, and after the determination of D <d, the current number of diversity is increased by one in S107. By repeating S106 and S107, the current number of diversity can be increased to the number of diversity required for reception. With the above processing, when the energization of the antenna is changed and the current number of diversity becomes the same as the minimum required number of diversity, the processing is terminated.

  In the above description, it is assumed that the information guide device of the present invention is applied to a vehicle-mounted antenna, but it can also be applied to a mobile communication terminal such as a mobile phone. Further, in the route guidance service using a terminal such as a mobile phone, the map data necessary for the route guidance function is not stored in the storage device in the terminal. Therefore, the receivable area database is stored in the external server. From the route guidance application on the mobile communication terminal side, route search conditions such as departure point, destination, departure date and time, arrival date and time, and information regarding the reception status of the antenna are sent to an external server. The external server acquires a receivable area related to the broadcast tower used from the current location to the destination based on information received from the mobile communication terminal and current traffic information, and based on the acquired receivable area. A route search is performed and the search result is transmitted to the route guidance application. Thereby, also in the mobile communication terminal, it is possible to realize a route search using a more accurate receivable area reflecting the current broadcast reception status.

  The above is the description regarding the embodiment of the present invention. In the above description, the coverage area is calculated using the fitting function, but a large number of actual measurement values according to various conditions are collected in advance, and the actual measurement values closest to the current use conditions are adopted. Thus, a configuration in which a receivable area is generated without using a function, such as calculating a receivable area, may be used. In addition, the reference receivable area is created based on the diversity of the four systems, but based on the diversity of the other system, the receivable area corresponding to the diversity other than the system is created by subtraction or addition. You may do it.

DESCRIPTION OF SYMBOLS 1 TV antenna 2 Broadcast receiving part 3 Control part 5 Display part 6 VICS antenna 8 GPS antenna 7, 17 Path search part 9 Input part 18 Antenna change part 41 GPS signal acquisition part 42 Receivable area acquisition part 43 Receivable area storage part 44 Receivable area calculation unit 45 Route calculation unit 46 VICS signal acquisition unit 47 Input condition acquisition unit 48 Vehicle signal acquisition unit 55 Antenna energization change unit

Claims (9)

An information guide device having a broadcast receiving unit for receiving broadcast radio waves transmitted from a broadcast tower and a receivable area acquiring unit for acquiring a receivable area of the broadcast tower,
A route search condition input unit for inputting a route search condition;
A broadcast tower specifying unit that calculates a current position of the information guide device from a GPS signal and specifies a broadcast tower to be used in a route from the current position to a destination included in the route search condition;
A receivable area storage unit for storing the receivable area;
The receivable area for each broadcast tower specified by the broadcast tower specifying unit is extracted from the receivable area storage unit, and stepwise within each extracted receivable area based on the current reception conditions of the broadcast receiving unit A route calculation unit that selects at least one of the different regions and calculates a route capable of receiving the broadcast radio wave from each selected region and the route search condition;
An information guide device comprising: An information guide device having a broadcast receiving unit for receiving broadcast radio waves transmitted from a broadcast tower and a receivable area acquiring unit for acquiring a receivable area of the broadcast tower,
A route search condition input unit for inputting a route search condition;
A broadcast tower specifying unit that calculates a current position of the information guide device from a GPS signal and specifies a broadcast tower to be used in a route from the current position to a destination included in the route search condition;
A receivable area storage unit for storing the receivable area;
The receivable area for each broadcast tower specified by the broadcast tower specifying unit is extracted from the receivable area storage unit, and different areas are set in stages based on the extracted receivable areas. A receivable area calculation unit to calculate,
Based on the current receiving conditions of the broadcast receiving unit, select at least one region of stepwise different regions within each receivable area calculated by the receivable area calculating unit, and select each region and the route A route calculation unit that calculates a route through which the broadcast radio wave can be received from a search condition;
An information guide device comprising:   The information guide device according to claim 1, wherein the route calculation unit further calculates the route using traffic information included in a VICS signal.   The information guide device according to any one of claims 1 to 3, wherein the reception condition includes an antenna number, an antenna gain, and a diversity number of the broadcast receiving unit.   The information guidance device according to any one of claims 1 to 4, further comprising a display unit for displaying the route calculated by the route calculation unit. An information guide device having a broadcast receiving unit for receiving broadcast radio waves transmitted from a broadcast tower and a receivable area acquiring unit for acquiring a receivable area of the broadcast tower,
A broadcast tower identifying unit that identifies a broadcast tower that is currently receiving the broadcast,
A receivable area storage unit for storing the receivable area;
The receivable area for the broadcast tower specified by the broadcast tower specifying unit is extracted from the receivable area storage unit, and the steps differ within the extracted receivable area based on the current reception conditions of the broadcast receiving unit. For each region, an antenna energization changing unit that changes the number of antennas of the broadcast receiving unit to be energized,
An information guide device comprising: An information guide device having a broadcast receiving unit for receiving broadcast radio waves transmitted from a broadcast tower and a receivable area acquiring unit for acquiring a receivable area of the broadcast tower,
A broadcast tower identifying unit that identifies a broadcast tower that is currently receiving the broadcast,
A receivable area storage unit for storing the receivable area;
The receivable area for the broadcast tower specified by the broadcast tower specifying unit is extracted from the receivable area storage unit, and a receivable area in which different areas are set in stages is calculated based on the extracted receivable area. A receivable area calculation unit to
An antenna that changes the number of antennas of the broadcast receiving unit to be energized for each stepwise different area within the receivable area calculated by the receivable area calculating unit based on the current reception conditions of the broadcast receiving unit An energization changing section;
An information guide device comprising:   8. The information guide device according to claim 6, wherein the reception condition includes an antenna number, an antenna gain, and a diversity number of the broadcast receiving unit. An information guide device having a broadcast receiving unit for receiving broadcast radio waves transmitted from a broadcast tower,
A route search condition input unit for inputting a route search condition;
A current position calculation unit for calculating a current position of the information guide device from a GPS signal;
An information transmission unit for transmitting the current position and the route search condition to an external server;
By the external server, from at least one region of stepwise different regions within the receivable area for each broadcast tower used in the route from the current position to the destination included in the route search condition and the route search condition An information receiving unit that receives from the external server a route through which the calculated broadcast radio wave can be received;
A display unit for displaying the received route;
An information guide device comprising:

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